I can deal with biases because like you said I can sense truthfulness (good faith), and triangulate multiple sources to form an image by trusting my own bias. Bias and different perspectives are everywhere and carry valuable signals.
What I can’t sense is that I can check all sources to find what is actually true. His solution is to proxy our sense-making to some collective intelligence (community) grown in a positive-sum game. But our current game is zero-sum, and information becomes competitive rather than collaborative, which incents (guarantees) institutional distortion (e.g. obscuring, disinforming, context-shrinking).
Aside for describing the problem, I think he covers some practical ways to make sense of things in the broken information ecology, but I haven’t gone over that part in any detail yet.
I find that it gives me a much better "BS" (bad faith or belief-driven argument) whichever side it comes from; and the good arguments are then free to flow irrespective of our perception of 'sides': it does not matter who said it, or whether it contradicts other elements; if there's truth to it, then it deserves to be explored, integrated. That's reality for us.